CN111007688B

CN111007688B - Light source device

Info

Publication number: CN111007688B
Application number: CN201811168905.4A
Authority: CN
Inventors: 余新; 张贤鹏; 常静; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2018-10-08
Filing date: 2018-10-08
Publication date: 2022-05-27
Anticipated expiration: 2038-10-08
Also published as: WO2020073812A1; CN111007688A

Abstract

The present invention protects a light source device including: an excitation light source for emitting excitation light; the rotating cylinder comprises a plurality of wavelength conversion units which are arranged on the side surface of the rotating cylinder and distributed along the circumferential direction, the wavelength conversion units comprise wavelength conversion materials and are used for absorbing exciting light and emitting excited light, and the driving device is used for driving the rotating cylinder to rotate around the central axis of the rotating cylinder; the exciting light enters the wavelength conversion unit along the radial direction of the rotary drum, and the excited light exits from the wavelength conversion unit along the axial direction of the rotary drum. The wavelength conversion unit is arranged on the peripheral side of the rotary cylinder, so that the exciting light is incident to the wavelength conversion unit along the radial direction of the rotary cylinder, the received laser is emergent from the wavelength conversion unit along the axial direction of the rotary cylinder, and the incident light spot of the exciting light is completely separated from the emergent light spot of the received laser, so that the area of the incident light spot can be arbitrarily enlarged under the condition that the size of the emergent light spot is not changed, and the high brightness and the compact structure of the light source device are realized.

Description

Light source device

Technical Field

The present invention relates to the field of optical technology, and in particular, to a light source device.

Background

The existing illumination light sources mainly comprise LED, xenon lamp and halogen lamp light sources, and the LED, xenon lamp and halogen lamp light sources respectively have the defects of short illumination distance caused by insufficient brightness, short service life, large beam divergence angle and the like. As a new illumination technology, laser illumination is a development trend of future illumination due to characteristics of high brightness, long service life, small collimation and divergence angle of laser beams, and the like.

In order to obtain white light for illumination and display, a red-green-blue laser or a laser excited wavelength conversion material (such as fluorescent powder) is used. The white light obtained by the red, green and blue lasers has a large color gamut range, high brightness and high cost, and is suitable for being applied to the high-end display field. For the illumination field, the red, green and blue laser covers a narrow wavelength range and a low display index, and is not practical. The white light obtained by exciting the wavelength conversion material with laser also has the characteristic of high brightness, and is more economical than the red, green and blue laser, and the bottleneck is mainly whether the wavelength conversion material can endure the laser irradiation with high power density, and the luminous efficiency of the wavelength conversion material is easily reduced at high temperature.

In the field of high-brightness projection display in the prior art, a fluorescent color wheel which is rotated by laser excitation is used to obtain fluorescent light with high energy density for display. The technical scheme utilizes the rotation of the fluorescent color wheel to prevent the wavelength conversion material from being continuously irradiated by the laser with high power density, so that the generated heat can be dissipated as soon as possible. In order to further improve the emitted fluorescence power density, the adopted fluorescence color wheel has larger and larger diameter, so that the advantage of small volume of the laser light source is gradually reduced; on the other hand, the exciting light power per unit area is reduced by enlarging the size of the incident light spot of the laser on the wavelength conversion material, and the area of the emergent light spot is directly related to (approximately equal to) the area of the incident light spot no matter the transmissive color wheel or the reflective color wheel, so that the size of the light collection system of the emergent light is increased along with the size of the incident light spot, and the compact structural design is not facilitated. In addition, the improvement of the radiating effect brought through enlarging the facula area is non-linear, and the heat at facula center is more and more difficult to disperse away, and this results in the heat dissipation income to decrement, and this kind of technical scheme's luminance improves and does not have the expansibility.

Disclosure of Invention

In view of the above-mentioned problem that it is difficult to solve heat dissipation and high brightness at the same time with the light source of the prior art, the present invention provides a light source device with high brightness and small volume, comprising: an excitation light source for emitting excitation light; the rotating cylinder comprises a plurality of wavelength conversion units which are arranged on the side surface of the rotating cylinder and distributed along the circumferential direction, wherein each wavelength conversion unit comprises a wavelength conversion material and a driving device, the wavelength conversion material is used for absorbing the exciting light and emitting excited light, and the driving device is used for driving the rotating cylinder to rotate around the central axis of the rotating cylinder; the excitation light enters the wavelength conversion unit along the radial direction of the rotary drum, and the stimulated light exits from the wavelength conversion unit along the axial direction of the rotary drum.

Compared with the prior art, the invention has the following beneficial effects: the wavelength conversion unit is arranged on the peripheral side of the rotary cylinder, so that the exciting light is incident to the wavelength conversion unit along the radial direction of the rotary cylinder, the received laser is emergent from the wavelength conversion unit along the axial direction of the rotary cylinder, and the incident light spot of the exciting light is completely separated from the emergent light spot of the received laser, so that the area of the incident light spot can be arbitrarily enlarged under the condition that the size of the emergent light spot is not changed, and the high brightness and the compact structure of the light source device are realized.

In one embodiment, the total area of an incident light spot of the excitation light incident on the wavelength conversion unit is larger than the total area of an emergent light spot of the stimulated light emergent from the wavelength conversion unit. The technical scheme enables the optical power density of emergent light to be higher than that of a conventional color wheel scheme under the condition that the exciting light energy is the same.

In one embodiment, the excitation light comprises an array of sub-excitation light beams, and an array of incident sub-spots arranged along the axial direction of the rotating drum is formed on the surface of the wavelength conversion unit. The technical scheme increases the size of the incident light spot in the direction parallel to the rotating cylinder shaft, greatly increases the total area of the incident light spot, reduces the heat generation of the unit area of the wavelength conversion unit, is beneficial to the working of the wavelength conversion material at a lower temperature, and has higher luminous efficiency.

In one embodiment, the excitation light source comprises an array of sub-excitation light sources for emitting the array of sub-excitation light beams; or the excitation light source comprises a laser light source and a reflector array, the reflector array comprises a plurality of reflectors which are arranged in parallel, the reflectivity of each reflector is gradually increased and the transmissivity of each reflector is gradually reduced along the direction far away from the laser light source, the excitation light emitted by the laser light source is sequentially incident to each reflector of the reflector array along the same direction, and the excitation light is reflected to form the parallel sub-excitation light beam array.

In one embodiment, the wavelength conversion unit includes first and second oppositely disposed surfaces, first and second oppositely disposed end faces, and two side faces connecting the first and second surfaces; the first surface is a light incident surface of the wavelength conversion unit, the first surface is parallel to a central axis of the rotary cylinder, the first end surface is a light emergent surface of the wavelength conversion unit, the first end surface is perpendicular to the central axis of the rotary cylinder, the area of the first end surface is smaller than that of the first surface, and the second surface and the second end surface are both light reflecting surfaces.

In one embodiment, the first surface is provided with a filter film layer that transmits the excitation light and reflects the stimulated light. The technical scheme is favorable for improving the utilization rate of exciting light and ensuring that the excited light is totally emitted from the light emergent surface different from the light incident surface.

Preferably, the angle selection film layer is arranged on the first surface, transmits the excitation light with the incident angle smaller than the preset angle, and reflects the stimulated laser light and the excitation light with the incident angle larger than the preset angle. The technical scheme enables the wavelength conversion unit to emit mixed light of exciting light and excited light.

In one embodiment, the wavelength conversion unit includes a wavelength conversion layer disposed adjacent to the second surface with a cavity or high refractive index medium therebetween.

In one embodiment, the wavelength converting layer of each of the wavelength converting units is part of a continuum.

In one embodiment, the wavelength conversion unit comprises a fluorescent single crystal, and the first surface and the second surface are two opposite surfaces of the fluorescent single crystal.

In one embodiment, the light-blocking sheet is disposed between the side surfaces of the adjacent wavelength conversion units, and has a light-reflecting property.

In one embodiment, the optical device further comprises a light collecting device disposed on the emergent light path of the excited light, the light collecting device comprises a light homogenizing rod, a compound parabolic condenser or a light collecting lens, and the incident surface area of the light collecting device is greater than twice the area of the first end surface. When the incident light spot irradiates the joint of two adjacent wavelength conversion units, the two wavelength conversion units emit light, and the technical scheme ensures that even under the condition, the light collection device can still collect the light emitted by the wavelength conversion units to a rear light path as much as possible.

In one embodiment, the spin basket further comprises a cylindrical base around which the wavelength conversion unit is disposed, the cylindrical base having a cavity within which heat sink fins are disposed. This technical scheme utilizes the inner space of a rotatory section of thick bamboo to form heat dissipation channel. Furthermore, the radiating fins are arranged in a turbine mode and drive air flow to flow in a single direction, a self-radiating structure is formed, and the radiating effect is improved.

Drawings

Fig. 1 is a schematic structural diagram of a light source device according to a first embodiment of the invention.

Fig. 2 is a cross-sectional view of a rotary cylinder of the light source device shown in fig. 1.

FIG. 3 is a schematic diagram showing the positional relationship between the spin basket and the excitation light at different time intervals.

Fig. 4 is a schematic structural diagram of a light source device according to a second embodiment of the invention.

Fig. 5 is a schematic structural diagram of a light source device according to a variation of the second embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a light source device according to a third embodiment of the present invention.

Fig. 7 is a cross-sectional view of a rotary cylinder of the light source device shown in fig. 6.

FIG. 8 is a view showing a wavelength conversion unit of a light source device according to a modification of the third embodiment of the present invention

The structure is schematic.

Fig. 9 is a schematic structural diagram of a light source device according to a fourth embodiment of the present invention.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the drawings and the embodiments.

Fig. 1 is a schematic structural diagram of a light source device according to a first embodiment of the invention. The light source device 10 includes a laser light source 110, a rotary cylinder 120, and a driving device 130. The laser light source 110 emits excitation light L1, and the excitation light L1 is irradiated on the side surface of the rotary drum 120 in the radial direction of the rotary drum 120. The driving device 130 is connected to the spin basket 120, and drives the spin basket 120 to rotate around the central axis AX thereof, so that different regions of the spin basket 120 are irradiated with the excitation light L1, and the driving device 130 specifically includes a motor and a connecting portion connecting the motor and the spin basket 120.

The spin basket 120 includes a plurality of wavelength conversion units 121 disposed at a side surface thereof and distributed along a circumferential direction. Under the driving of the driving device 130, the wavelength conversion units are sequentially located on the light path of the excitation light L1 in time sequence. The wavelength conversion unit 121 includes a wavelength conversion material, and the excitation light L1 incident on the wavelength conversion unit is at least partially absorbed and converted into the stimulated light L2 to be emitted. The received laser light L2 is emitted from the wavelength conversion unit 121 along the axial direction (and the AX axial direction) of the rotary drum 120.

It can be seen that the light incident surface and the light exit surface of the wavelength conversion unit 121 are two different surfaces, and the emitted stimulated light L2 is changed by 90 ° with respect to the original incident excitation light L1 (it is understood that "along the axial direction" and "along the radial direction" are not strictly along the direction, and the beam angle within the error range is also within the protection range of the present invention, for example, within ± 5 ° from the radial direction or the axial direction), so that the total area of the incident light spot is not necessarily related to the size of the total area of the exit light spot. Unlike the color wheel scheme, the area of the emergent light spot is always similar to that of the incident light spot no matter the reflective color wheel or the transmissive color wheel is adopted. The technical scheme of the invention has higher design freedom, and different incident surface areas and emergent surface areas can be respectively designed according to the brightness requirement of emergent light and the size requirement of a rear light path device to obtain the required light beams.

In the present embodiment, the total area of the incident light spot of the excitation light L1 incident on the wavelength conversion unit 121 is larger than the total area of the emergent light spot of the excited light L2 emitted from the wavelength conversion unit 121, and the optical power density of the emergent light can be improved.

The focus of the present invention is on the structure of the rotary cylinder and the relationship between the light incident surface and the light emitting surface of the rotary cylinder. The structure of the spin basket 120 of the present embodiment will be described in further detail below.

Referring to fig. 1 and fig. 2, fig. 2 is a cross-sectional view of a rotary drum of the light source apparatus shown in fig. 1, where reference numerals in the two figures may be referred to each other. As shown in fig. 1 and 2, 16 wavelength conversion units are circumferentially arranged along the side surface of the spin basket 120 (it is understood that 16 wavelength conversion units are exemplified in the present embodiment, and the number of wavelength conversion units is not limited). In this embodiment, the wavelength conversion units have the same size.

The wavelength conversion unit 121 includes first and second oppositely disposed

surfaces

1211 and 1212, including first and second oppositely disposed end faces 1213 and 1214, and two side faces 1215 and 1216 connecting the first and second surfaces.

The first surface 1211 is a light incident surface of the wavelength conversion unit 121, the first surface 1211 is parallel to the central axis AX of the rotary cylinder 120, and the second surface 1212 opposite to the first surface 1211 is a light reflecting surface (e.g., a mirror reflecting surface, a diffuse reflecting surface) to prevent the excitation light from directly exiting. The first end surface 1213 is a light emitting surface of the wavelength conversion unit, the first end surface 1213 is perpendicular to the central axis AX of the rotary cylinder, and the second end surface 1214 opposite to the first end surface 1213 is a light reflecting surface (e.g., a specular reflecting surface, a diffuse reflecting surface) so that the received laser light L2 is emitted from the first end surface 1213. The first surface 1211 has a larger size in a direction along the central axis AX such that the area of the first surface 1211 is larger than the first end surface 1213.

In this embodiment, the first surface 1211 further includes a filter layer 1211a for transmitting the excitation light and reflecting the stimulated light. The filter layer 1211a ensures that the received laser light does not exit from the first surface 1211, so that the received laser light is concentrated on the small area of the first end surface 1213.

In a further embodiment of the present embodiment, the filter film 1211a may be optimized as an angle filter, which transmits the excitation light with an incident angle smaller than a predetermined angle (e.g., 5 °), reflects the stimulated light, and transmits the excitation light with an incident angle larger than the predetermined angle (e.g., 5 °). Further, the filter 1211a may be a 0 ° angle filter, which transmits only the excitation light incident perpendicularly, reflects the excitation light at other angles, and reflects all the stimulated light. According to the technical scheme, the emergent light not only contains the excited light, but also contains the exciting light, and under the condition that the exciting light is blue light, the mixed light of the blue light and the yellow light can be obtained by combining the yellow wavelength conversion material and is used as the emergent light, so that the white light is obtained.

In the present embodiment, between the side faces of the adjacent wavelength conversion units, the light-blocking sheet 123 is further provided, and the light-blocking sheet 123 has a light reflection property such that light incident on the side faces 1215 and 1216 of the wavelength conversion units is reflected back to the inside of the wavelength conversion unit 121. The light blocking sheet may be glass or sapphire coated with a high-reflection film layer, or may be a diffuse reflection material layer, or may be a reflection film layer (such as a metal reflection layer of silver, aluminum, or the like or a dielectric film reflection layer) directly coated on the side surface of the wavelength conversion unit, so as to separate the wavelength conversion units. When the light blocking sheet 123 is fixed by being inserted into the groove, or by being fixed by gluing.

The excitation light source in this embodiment may be a laser light source or an LED light source, which may be a single light source or a combined array of multiple light sources. The present embodiment does not further describe the excitation light source, and some embodiments of the excitation light source will be listed in the following embodiments.

The wavelength conversion material of the wavelength conversion unit 121 in this embodiment is a fluorescent single crystal, the internal main structure of the wavelength conversion unit 121 is the fluorescent single crystal, and the first surface 1211 and the second surface 1212 are two opposite surfaces of the fluorescent single crystal, respectively. The filter layer 1211a is directly plated on the first surface 1211 of the fluorescent single crystal.

The fluorescent single crystal may be, for example, a Ce: YAG single crystal, capable of absorbing blue light and emitting yellow light. Which is transparent or translucent so that the light beam can be conducted inside it and finally exit through the first end face 1213.

In this embodiment, the wavelength conversion units surrounding the rotating cylinder 120 are all the same fluorescent single crystal, and the light source device emits light with a single spectrum. It will be appreciated that in other embodiments of the invention, different types of wavelength converting elements may also be provided around the rotating drum to emit light of different spectra at different time periods.

The light source device 10 of the present embodiment further includes a light collection device 140 disposed on the emission light path of the received laser light L2. The light collecting device 140 of the present embodiment is a lens assembly composed of light collecting lenses.

Analysis shows that the emergent light spot position of the invention is not constant. Referring to fig. 3, the positional relationship between the spin basket 120 and the excitation light L1 is shown in different time periods. As shown in fig. 3, the rotary cylinder rotates clockwise, and is arranged in chronological order from left to right T1 → T2 → T3 → T4. The end face of the wavelength conversion unit marked by the oblique line corresponds to the emergent light spot. It can be seen that the position of the emergent light spot is constantly changing, and when the excitation light L1 is irradiated between two adjacent wavelength conversion units, the excitation light simultaneously enters the two wavelength conversion units, so that the area of the emergent light spot is enlarged by two times. However, the variation of the position and area of the excident light spot is periodically changed within the dotted line frame shown in the figure.

To ensure that the light collection means is able to collect the excident light spot completely, it is necessary to make the incident surface area of the light collection means at least more than twice the area of the first end surface. For the light collecting lens of this embodiment, the area of the incident surface of the light collecting device is the area of the light spot that can be collected by the light collecting lens at the object plane position.

The spin basket 120 of the present embodiment further includes a cylindrical base 122 for carrying the wavelength conversion unit 121, and the wavelength conversion unit 121 is disposed around the cylindrical base 122.

The spin basket 120 of this embodiment further includes heat sink fins 124 disposed within the cavity of the tubular base 122. The radiating fins are arranged in a turbine mode and drive air flow to flow in a single direction, a self-radiating structure is formed, and the radiating effect is improved. It is to be understood that the heat sink 124 is not essential to the light source device of the present invention, and may not be provided.

In the first embodiment, the excitation light source 110 emits the excitation light L1 to the wavelength conversion unit of the spin basket 120 as a whole. In the present invention, the excitation light source may be a single light source, or may be composed of a light source array including a plurality of light sources.

Referring to fig. 4, which is a schematic structural diagram of a light source device according to a second embodiment of the present invention, a light source device 20 includes an excitation light source 210, a rotating cylinder 220, a driving device 230, and a light collecting device 240. The difference from the first embodiment shown in fig. 1 is that in the present embodiment, the excitation light source 210 includes a sub-excitation light source array for emitting a sub-excitation light beam array, the sub-excitation light beam array constitutes excitation light, and an incident sub-light spot array arranged along the axial direction of the rotary drum 220 is formed on the surface of the wavelength conversion unit. That is, the excitation light source 210 of the embodiment includes a plurality of sub-excitation light sources 211, and different sub-excitation light sources 211 form incident light spots on the surface of the rotating cylinder 220, so that the total area of the incident light spots is greatly increased, and it is not necessary to concentrate energy on one light spot too much to overload the wavelength conversion material. In this embodiment, the number of the sub-excitation light sources 211 that are turned on can be independently controlled to control the brightness of the output light. Meanwhile, the light output surface of the wavelength conversion unit is made, the total area size of the emergent light spot is not changed along with the area of the incident light spot, and the size of the light collecting device is ensured not to be adjusted.

In this embodiment, different sub-excitation light sources may have different excitation light spectral ranges.

In the second embodiment shown in fig. 4, another difference is that the light collecting device 240 of the present embodiment includes a light homogenizing rod, which is specifically a conical rod, and the area of the incident surface is smaller than that of the exit surface. The dodging rod is used for dodging emergent light of the wavelength conversion unit and reducing the divergence angle of the emergent light of the wavelength conversion unit. As in the first embodiment shown in fig. 1, in order to enable the light collection device 240 to collect most of the light emitted from the wavelength conversion unit, the area of the incident surface of the light collection device 240 needs to be larger than twice the area of the first end surface of the wavelength conversion unit. In the present embodiment, specifically, it is necessary to make the incident surface area of the integrator rod larger than twice the area of the first end face of the wavelength converting unit.

The structures of the rotary drum 220 and the driving device 230 in the second embodiment can refer to the descriptions of the rotary drum 120 and the driving device 130 in the first embodiment, and are not described again here.

Fig. 5 is a schematic structural diagram of a light source device according to a variation of the second embodiment shown in fig. 4. The light source device 20 ' includes an excitation light source 210 ', a rotary cylinder 220 ', a driving device 230 ', and a light collecting device 240 '.

The difference between the present embodiment and the second embodiment is specifically that the excitation light source 210 'and the light collection device 240' are different.

In this embodiment, although the excitation light emitted from the excitation light source 210' is also composed of the sub-excitation beam array, the obtaining method is different from that of the second embodiment. The excitation light source 210 ' in this embodiment includes a laser light source 211 ' and a mirror array 212 ', wherein the mirror array 212 ' includes a plurality of mirrors arranged in parallel, and each mirror gradually increases in reflectivity and gradually decreases in transmissivity along a direction away from the laser light source 211 ', and excitation light emitted from the laser light source 211 ' sequentially enters each mirror of the mirror array 212 ' along the same direction, and is partially transmitted and partially reflected, thereby finally forming a sub-excitation light beam array emitted in parallel. Compared with the second technical scheme, the excitation light source has higher position design flexibility, and the incident sub-light spot array with denser arrangement can be obtained without the limitation of the space requirement of adjacent lasers. In the embodiment, a high-power laser can be used for providing excitation light, and the sub-excitation light beam array is obtained through the mirror array.

The laser light source in this embodiment is disposed at a position far away from the laser-receiving outlet, and it can be understood that in other embodiments of the present invention, the laser light source may also be disposed at a side near the laser-receiving outlet, so as to implement folding of the light path and implement a compact structural design.

In this embodiment, the light collecting device 240' replaces the dodging rod of the light collecting device 240 in the second embodiment with a compound parabolic concentrator, an inlet of which is close to the first end face of the wavelength conversion unit, so as to collect the stimulated light L2. Likewise, in order to enable the light collection device 240 'to collect most of the light emitted by the wavelength conversion unit, it is necessary to make the incident surface area of the light collection device 240' more than twice the first end surface area of the wavelength conversion unit. In the present embodiment, in particular, it is necessary to make the inlet area of the compound parabolic concentrator larger than twice the area of the first end face of the wavelength conversion unit.

The light collecting devices listed above include a light homogenizing rod, a compound parabolic concentrator and a light collecting lens, and such structures can be used in any alternative or combination with each other in the embodiments of the present invention.

The structures of the rotary drum 220 'and the driving device 230' in the embodiment shown in fig. 5 can refer to the descriptions of the rotary drum 120 and the driving device 130 in the first embodiment, and are not described again here.

In the above embodiment, a technical scheme that the wavelength conversion unit includes a fluorescent single crystal is exemplified, and next, another wavelength conversion unit will be described.

Referring to fig. 6 and 7, fig. 6 is a schematic structural diagram of a light source device according to a third embodiment of the present invention, and fig. 7 is a cross-sectional view of a rotary drum of the light source device shown in fig. 6.

In the third embodiment, the light source device 30 includes an excitation light source 310, a rotating cylinder 320, a driving device 330, and a light collecting device 340. The excitation light source 310 may refer to the descriptions of the

excitation light sources

110, 210, or 210' in the above embodiments, the driving device 330 may refer to the descriptions of the driving device 130, and the light collecting device 340 may refer to the descriptions of the light collecting devices in the above embodiments, which are not described herein again.

In this embodiment, the spin basket 320 includes a cylindrical base 322 and a plurality of wavelength conversion units 321 disposed on a side surface of the spin basket 320 and distributed in a circumferential direction. The wavelength conversion unit 321 includes a first surface 3211 and a second surface 3212 disposed opposite to each other, a first end 3213 and a second end 3214 disposed opposite to each other, and two side surfaces connecting the first surface and the second surface. The first surface is a light incident surface of the wavelength conversion unit, the first end surface is a light emergent surface of the wavelength conversion unit, and the area of the first surface is larger than that of the first end surface.

The wavelength conversion unit 321 includes a wavelength conversion layer 321a and a high refractive index medium 321b (a medium having a refractive index of 1.6 or more, such as glass, sapphire, etc.), wherein the wavelength conversion layer 321a is disposed near the second surface 3212, and the high refractive index medium 321b is disposed between the wavelength conversion layer 321a and the first surface 3211. The excitation light L1 enters the wavelength conversion unit 321 through the first surface 3211, passes through the high refractive index medium 321b to reach the wavelength conversion layer 321a, and after being at least partially absorbed, the wavelength conversion layer 321a emits the excited light L2. The received laser light L2 is reflected and conducted in the high refractive index medium 321b, reaches the first end surface 3213, and then exits. In this embodiment, the reflected laser light incident on the first surface at a large angle may be totally reflected by using the refractive index difference between the high refractive index medium 321b and the outside air, or a filter film layer may be additionally disposed on the first surface to ensure the reflection and conduction of the reflected laser light.

In a modified embodiment of the third embodiment, the high refractive index medium 321b may be replaced by a cavity, and in this embodiment, a layer structure, such as a glass layer, needs to be additionally disposed on the first surface. Further, a filter film layer that transmits excitation light and reflects stimulated light needs to be disposed on the layer structure where the first surface is located, so that the stimulated light can be reflected and conducted to the first end surface.

In the present embodiment, as shown in fig. 7, the wavelength conversion layer of each wavelength conversion unit is a part of a continuous body, and the light blocking sheet separates the high refractive index medium 321b of each wavelength conversion unit. This technical solution can be implemented by surrounding the wavelength conversion layer on the outer surface of the cylindrical base 322 of the spin basket 320.

The wavelength conversion layer 321a in this embodiment may be a structure in which silica gel or epoxy resin is bonded with phosphor to form a layer, a structure in which glass powder is bonded with phosphor to form a layer after being softened/melted, a structure in which ceramic material is co-sintered with phosphor to form a layer, or a fluorescent single crystal.

The wavelength conversion material contained in the wavelength conversion layer 321a may be a single kind of phosphor, or may include two or more kinds of phosphors to adjust the spectral characteristics of the emitted light.

Fig. 8 is a schematic structural diagram of a wavelength conversion unit of a light source device according to a variation of the third embodiment of the present invention. As shown in the figure, the wavelength conversion unit 321 ' includes a wavelength conversion layer 321 ' a and a high refractive index medium 321b ', where the wavelength conversion layer 321 ' a includes three wavelength conversion sublayers 321a ' 1, 321a ' 2, and 321a ' 3, each wavelength conversion sublayer contains different phosphors, and different wavelength conversion sublayers are irradiated by light spots formed by excitation photon beams at different positions, so as to adjust an emergent light spectrum.

Fig. 9 is a schematic structural diagram of a light source device according to a fourth embodiment of the invention. The light source device 40 includes an excitation light source 410, a rotary cylinder 420, and a driving device 430. The rotating cylinder 420 includes a cylindrical base 422, wavelength conversion units 421 and heat dissipation fins 424, the rotating cylinder 420 includes a plurality of wavelength conversion units 421, and the wavelength conversion units 421 are distributed along the circumferential direction on the side surface of the rotating cylinder.

The difference from the above embodiments is that in the present embodiment, the wavelength conversion unit 421 is located on the inner surface of the rotary cylinder 420 rather than the outer surface, that is, the cylindrical base 422 surrounds the wavelength conversion unit 421. Under the driving of the driving device 430, the cylindrical base 422 drives the wavelength conversion unit 421 to rotate around the central axis AX of the rotary cylinder 420.

The wavelength conversion unit 421 of the present embodiment also includes a first surface 4211 and a second surface 4212 which are oppositely arranged, a first end surface 4213 and a second end surface 4214 which are oppositely arranged, and two side surfaces connecting the first surface and the second surface. The first surface 4211 is a light incident surface of the wavelength conversion unit and is close to the central axis AX with respect to the second surface 4212. The first end surface 4213 is a light exit surface of the wavelength conversion unit. The second surface 4212 and the second end surface 4214 and both side surfaces are reflective surfaces.

The excitation light L1 emitted from the excitation light source 410 in the present embodiment is emitted radially outward from the inside of the rotating drum so as to be incident on the wavelength conversion unit 421. The excited light generated by the wavelength conversion unit 421 is emitted from the first end surface in the axial direction.

The excitation light source 410 in the fourth embodiment includes a laser light source and a mirror array, and the specific structure can be described with reference to the embodiment shown in fig. 5. The excitation light source 410 in this embodiment may be replaced with the excitation light source shown in fig. 1 or fig. 4, but it should be noted that the internal space of the rotary drum 420 is limited, it is difficult to directly place the light source, and the excitation light L1 may be guided into the rotary drum by using a light guiding device such as a mirror.

In the fourth embodiment, since the wavelength conversion unit 421 is provided on the inner surface of the rotary cylinder, it is difficult to provide the heat sink on the inner side, and the heat sink 424 in the fourth embodiment is provided on the outer side of the cylindrical base 422 to improve the heat radiation effect. It is understood that the various embodiments described above may be provided with heat radiating fins on the inside and outside of the cylindrical base body without affecting the optical path.

For specific materials and structures of the wavelength conversion unit 421 in the fourth embodiment, reference may be made to the description in the foregoing embodiments, and details are not repeated here.

The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A light source device, comprising:

an excitation light source for emitting excitation light;

the rotating cylinder comprises a plurality of wavelength conversion units which are arranged on the side surface of the rotating cylinder and distributed along the circumferential direction, and the wavelength conversion units comprise wavelength conversion materials which are used for absorbing the exciting light and emitting excited light;

the driving device is used for driving the rotating cylinder to rotate around the central axis of the rotating cylinder so as to enable the plurality of wavelength conversion units to be sequentially positioned on the light path of the exciting light in a time sequence;

the exciting light enters the wavelength conversion unit along the radial direction of the rotary drum, the excited light exits from the wavelength conversion unit along the axial direction of the rotary drum, and the total area of incident light spots of the exciting light entering the wavelength conversion unit is larger than the total area of emergent light spots of the excited light exiting from the wavelength conversion unit.

2. The light source device according to claim 1, wherein the excitation light includes an array of sub-excitation light beams, and an array of incident sub-light spots arranged along an axial direction of the rotary drum is formed on a surface of the wavelength conversion unit.

3. The apparatus according to claim 2, wherein the excitation light source comprises an array of sub-excitation light sources for emitting the array of sub-excitation light beams; or

The excitation light source comprises a laser light source and a reflector array, the reflector array comprises a plurality of reflectors which are arranged in parallel, the reflectivity of each reflector is gradually increased and the transmissivity of each reflector is gradually reduced along the direction far away from the laser light source, the excitation light emitted by the laser light source sequentially enters each reflector of the reflector array along the same direction, and the excitation light forms a parallel sub-excitation light beam array after being reflected.

4. The light source device according to claim 1, wherein the wavelength conversion unit includes a first surface and a second surface which are oppositely disposed, a first end face and a second end face which are oppositely disposed, and two side faces which connect the first surface and the second surface;

the first surface is a light incident surface of the wavelength conversion unit, the first surface is parallel to a central axis of the rotary cylinder, the first end surface is a light emergent surface of the wavelength conversion unit, the first end surface is perpendicular to the central axis of the rotary cylinder, the area of the first end surface is smaller than that of the first surface, and the second surface and the second end surface are both light reflecting surfaces.

5. The light source device according to claim 4, wherein the first surface is provided with a filter film layer which transmits the excitation light and reflects the stimulated light.

6. The light source device according to claim 4, wherein the wavelength conversion unit includes a wavelength conversion layer disposed adjacent to the second surface, and a cavity or a high refractive index medium is between the wavelength conversion layer and the first surface.

7. The light source device of claim 6, wherein the wavelength conversion layer of each wavelength conversion unit is part of a continuum.

8. The light source device according to claim 4, wherein the wavelength conversion unit includes a fluorescent single crystal, and the first surface and the second surface are two opposite surfaces of the fluorescent single crystal.

9. The light source device according to claim 4, further comprising a light blocking sheet provided between the side faces of the adjacent wavelength conversion units, the light blocking sheet having a light reflection property.

10. The light source device according to claim 4, further comprising a light collecting device disposed on the emitting light path of the stimulated light, wherein the light collecting device includes a light homogenizing rod, a compound parabolic condenser or a light collecting lens, and an incident surface area of the light collecting device is greater than twice the area of the first end surface.

11. The light source device according to claim 1, wherein the rotary cylinder further comprises a cylindrical base body, the wavelength conversion unit is disposed around the cylindrical base body, and a heat sink is disposed in a cavity of the cylindrical base body.